Corrosion and Cathodic protection


SCPC –
Data logger to monitor Cathodic Protection

Voltage Measurement
Measurement range : ± 1V, Resolution: < 1mV
Accuracy (linearity, hysteresis, repeatability): <10mV
Input impedance of the measurement stage: > 1011 Ohms

Current Measurement
CPC ref. 60-07-040/22: 5 shunts available: 22, 44, 66, 88 or 110 Ohms
CPC ref. 60-07-040/33: 5 shunts available: 33, 66, 99, 132 or 165 Ohms
Measurement range: 30µA at 10mA, resolution: <3µA
Accuracy (linearity, hysteresis, repeatability): <50µA
Input impedance of the measurement stage: > 1011 Ohms

 

CPC Corrosion


Data Logger
Sampling rate programmable from 0.01s to 99hrs Memory capacity: 32kb with data compression (64kb optional) Communication: Electromagnetic transmission without connector, using a reading interface (Data Pencil) connected to a PC serial link. Energy: 3 Lithium batteries, autonomy > 3 years at 1h sampling rate

Mechanical
Max. operating depth: 3000 dBar Operating temperature: 0 to +30°C Length: 274mm Diameter: 40mm Weight: 0.950 kg

Applications
The SCPC allows in situ determination of the value of current density needed in order to protect an immersed metallic structure, and thus to define the size and quantity of the sacrificial anodes or the current power supply of the cathodic protection system. This current density is linked to the environmental parameters (dissolved oxygen, marine current and temperature) which influence the electrochemical reactions on the surface of the structures to be protected. The SCPC comprises one zinc reference electrode, one sacrificial anode and one cathode (the metal to be protected). The SCPC allows the measurement and recording of the difference of potential between the reference electrode and the cathode, as well as the current that circulates between the anode and this same cathode.  


SPC – 
Cathodic Protection monitoring

Measurement Characteristics
One voltage channel for the measurement of the corrosion potential of the structure (in relation to a Zinc reference anode)
Measurement range: ± 1V
Resolution: < 1mV
Accuracy (linearity, hysteresis, repeatability): <10mV
Input impedance of measurement stage: > 1011 Ohms
One channel for the measurement of the current of cathodic protection
Measurement shunt: 1 Ohm
Measurement range: from 30µA to 10mA
Resolution: <3.5µA
Accuracy (linearity, hysteresis, repeatability) : <50µA

Electronic Characteristics
Sampling rate programmable from 0.01s to 99hrs
Memory capacity: 32kb with data compression (64kb optional)
Communication interface: inductive transmission, via a Data Pencil connected to a computer.
Energy: 3 Lithium batteries, 1 to 5 years autonomy depending on sampling rate

 

SPC Corrosion


Mechanical Characteristics
Maximum depth: 30 dBar
Operating temperature: 0 to +30°C
Dimensions: Length 90mm, Diameter 100mm

Applications
The SPC allows monitoring of port and offshore structures under cathodic protection.
In order to do this, it records the corrosion potential and the current density received by a coupon (unit of elementary area). The coupon is electrically connected to the structure via the SPC, and is thus a representation of its level of cathodic protection.


SPCT – 
Corrosion potential and temperature data logger

Characteristics
Temperature
Measurement range: -2°C/+30°C.
Maximum resolution: 11m°C at 0°C, 13m°C at 10°C, 20m°C at 20°C
Accuracy: lower than 0.5°C
Sensor: Thermistor
Response time: < 10 min at 63%

 

spct Corrosion


Voltage
The voltage measured corresponds to the potential difference between the test point and the measuring electrode in pure zinc.

Standard range
Measuring range: -1900mV to +1900mV
Resolution: < 1.5 mV
Accuracy (hysteresis, linearity and repeatability): +/-10mV
High impedance input: > 109 Ohms

Reduced range
Measuring range: -100mV to +550mV
Resolution: < 220µV
Accuracy (hysteresis, linearity and repeatability): +/-2mV
High impedance input: > 109 Ohms
Optional: Possible range if a silver/silver chloride measuring electrode is used
Mechanical characteristics
Dimensions: length: 165mm, diameter: 35mm.
Materials: Body made of engineered plastic, plug, threaded rod and nut made of Titanium.
Weight in air: approx. 200g
Maximum immersion: 450 dBar.

Applications
SPCT allows the in situ recording of temperature and corrosion potential between a test point (made of an immersed metallic structure) and a measuring electrode in zinc.


SPC4
Corrosion potential data logger

 

Measurement Characteristics
4 voltage channels to measure the corrosion potential in relation to a reference anode:
Measuring range: ±1V
Resolution: lower than 1mV
Accuracy (hysteresis, linearity and repeatability): lower than 10mV
Input impedance of the measuring stage: higher than 1011 Ohms
4 current channels to measure the protection current:

10mA range on channel 4
Measurement shunt: 0.5 Ohm (voltage drop 5mV under 10mA).
Measuring range: 100µA to 10mA
Resolution: lower than 3µA
Accuracy (hysteresis, linearity and repeatability): lower than 100µA

20mA range on channel 5
Measurement shunt: 0.25 Ohm (voltage drop 5mV under 20mA).
Measuring range: 200µA to 20mA
Resolution: lower than 6µA
Accuracy (hysteresis, linearity and repeatability): lower than 200µA

Open range on channel 6
No measurement shunt: the customer selects his shunt. The shunt will be placed near the coupon to evaluate the noise.

50mA range on channel 7
Measurement shunt: 0.1 Ohm (voltage drop 5mV under 50mA).
Measuring range: 500µA to 50mA
Resolution: lower than 15µA
Accuracy (hysteresis, linearity and repeatability): lower than 500µA

50µA range on channels 4, 5, 6, 7
Measurement shunt: 100.5 Ohm shunt. (voltage drop 5mV under 50µA).
Measuring range: 500nA to 50µA
Resolution: lower than 20nA
Accuracy (hysteresis, linearity and repeatability): lower than 500µA.

 

 

spc4 Corrosion


Applications
The SPC4 sensor allows the measurement of the protection current of a structure under cathodic protection. The principle of measurement of the SPC4 sensor is based on the use of a steel coupon of the same nature as that of the structure.

This coupon is attached to the surface of the structure and masks a known surface of the latter. It is electrically connected via the SPC4 sensor. This allows the protection current to be “captured” and measured, and thus to evaluate its density.

The SPC4 sensor is equipped with 8 measuring channels (4 for current, 4 for voltage) and therefore allows four coupons to be connected.

EPC8 –  8-channel corrosion potential data logger

Measurement
8 voltage channels to measure the corrosion potential in relation to the reference electrode:

Measuring range: +/-1.9VDC
Resolution: lower than 1mV
Accuracy: <0.2% of the dynamic measurement, i.e. ±8mVDC. Includes: hysteresis, linearity, repeatability and drift in the 0-30°C operating temperature range.
Voltage of the reference electrode: 1.98 Vdc

The parameter setting and reading of the EPC8 data logger are performed without opening the housing, using the WinMemo software and the Data Pencil. The latter is connected to the serial link of a PC computer at one end, and placed against the centre of the induction read zone (marked) at the other so as to establish the connection with the EPC8.

Applications
It allows the potential difference to be measured between a coupon and a reference electrode. It comprises 8 independent measuring channels. The EPC8 is autonomous and designed to be installed in a humid marine environment.

 

epc8 Corrosion


ECAT – 
Atmospheric corrosion Recorder

 

Principle
ECAT allows to monitor the variation of resistance of a thin layer metallic sensor (copper, silver,…) for the determination of the corrosion index of a medium.

Data Logger
Autonomy > 2 years
Reading and programming via portable inductive link (Data Pencil), from a Windows PC software
Housing : IP65, dimensions : 64 x 50 x 37mm, weight 85g.

Measurement Characteristics
2 voltage channels, resolution : < 200nV
1 current channel, resolution : < 2.5nA

Applications
ECAT is an autonomous data logger that allows to monitor atmospheric corrosion. It can be used in confined spaces or in places where no electricity is available, for example : display housings (in museum), cabinets intended for the storage of invaluable or fragile objects, transport packaging, electrical items.

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ecat- Corrosion